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The Terrorkon, a creature that lives in the waters of Skaro, including in the Lake of Mutations is swimming near where the Daleks are installing new defences. An electric barrier the voltagstrem barrier, but while they are working on their rockets the Terrorkon breaks through the barrier, attacking the Daleks.

The Terrorkon takes one of the Daleks' rockets, tries to eat it whilst under the Daleks' city, but finds it inedible. Whilst musing under the city it is attacked by an eel.